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Query: keyword: "gemmology"

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 Book: 5th European Gemmological Symposium 15-16 June 2013: Program and abstracts
H. Zwaan, (2013), 43 p.
 Article: Gemmology, geology and origin of the Sandawana emerald deposits, Zimbabwe
J.C. Zwaan, in: Scripta Geologica, Vol. 131 (2006), p. 1-212